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MPI_Initialized

NAME

MPI_Initialized - Indicates whether MPI_Init has been called.

SYNTAX

C Syntax

 #include <mpi.h>
 int MPI_Initialized(int *flag)
 
 

 

Fortran Syntax

 INCLUDE 'mpif.h'
 MPI_INITIALIZED(FLAG, IERROR)
         LOGICAL FLAG 
         INTEGER IERROR 
 
 

 

C++ Syntax

 #include <mpi.h>
 bool Is_initialized()
 
 

 

OUTPUT PARAMETERS

flag

Flag is true if MPI_Init has been called and false otherwise.

IERROR

Fortran only: Error status (integer).

DESCRIPTION

This routine may be used to determine whether MPI_Init has been called. It is the only routine that may be called before MPI_Init is called.

ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object.

Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

SEE ALSO

MPI_Init